I used to work in them. Extra long ones.
Like this.
http://www.containerhouse.com/dnv_a60_containers.html
They used to get quite hot in the summer, even in the UK.
What about the insulation? Would it not make a nice nest for all sorts of creepy crawlies and reptiles? Would need to be well sealed. And rust proofed.
Have a look at this. These have been built for accomadation purposes:
http://www.containerhouse.com/living_quarters.html
Best painted white to reflect the sun.